You are certainly old enough to make healthy choices for your body.

My advice is just tell your mom that you want to eat healthy and leave the terms "low carb, Atkins, counting carbs" out of it.

Count your carbs to yourself. Eat as healthily as possible with veggies and good quality meats. No one in the whole world can dispute that.

Just don't talk about it with your mom. Just do it. Say "no thank you" to food offerings that don't work for you.

The proof is in the pudding. When you slim down and feel good there is nothing anyone can say.